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But the attractive acting pair appear to have been romancing each other as far back as MacKenzie's birthday bash in October 2015.

Heughan and Mauzy - best known for her role as Rapunzel in Into the Woods - also donned matching 'Equality' shirts for the United Voices Rally at the UTA headquarters in February.

Tourist: Contrary to on-set gossip, the 6ft3in Scottish heartthrob is dating the North Carolina-born 28-year-old, who shared two snaps of herself sightseeing at the Cape of Good Hope

Official: Sam and the Girls' Night Out starlet made their 'red carpet' debut as a couple at a LA awards season bash hosted by Piaget and The Weinstein Company on February 24

'Love and wishes and birthday dishes!' But the attractive acting pair appear to have been romancing each other as far back as MacKenzie's birthday bash in October 2015

Protesting pair: Heughan and Mauzy - best known for her role as Rapunzel in Into the Woods - also donned matching 'Equality' shirts for the United Voices Rally in February

The blonde beauty divorced her husband, troubled American Idol contestant John Arthur Greene, three years ago following two years of marriage.

On Saturday, the When the Starlight Ends stud thanked his 1.2M social media followers, tweeting: 'Thank you for all the birthday wishes, feeling very thankful. Looking forward to the year ahead!'

Sam addressed the repeated reports about hooking up with his two-time Golden Globe-nominated castmate a year ago.

Accidentally shot his brother to death: The blonde beauty divorced her husband, troubled American Idol contestant John Arthur Greene, three years ago (pictured in 2016)

On Saturday, the When the Starlight Ends stud thanked his 1.2M followers, tweeting: 'Thank you for all the birthday wishes, feeling very thankful. Looking forward to the year ahead!'

'I guess we're aware of it, and we're aware that some fans were upset, they felt they'd been duped or something, which is really strange because we're just doing our job,' the Royal Scottish Academy grad told Radio Times.

'I think if me and Caitriona were together we wouldn't say. Why would you? In this industry we give away so much of ourselves anyway. We talk about ourselves and we tell people stuff. I guess it's nice that we've done our job well enough to convince them.'

Fans can catch more heated sexual tension between the rebel Highlander and the WWII nurse in the 13-episode third season of Outlander, which premieres in September on Starz.

'We're just doing our job': Sam addressed the repeated reports about hooking up with his two-time Golden Globe-nominated castmate a year ago

Convincing: Fans can catch more sexual tension between the rebel Highlander and the WWII nurse in the 13-episode third season of Outlander, which premieres in September on Starz